I just got the Samsung M8 Smart Display webcam module working with macOS (on an M1 MacBook Pro) + Windows 11 and Linux on a dual boot PC - thanks to everyone on this thread who has contributed for your super helpful info.
What worked for me was connecting the SlimFit Cam module directly via a USB-C to USB-A cable to my device - the bottom of the camera module has a USB-C connector which is normally occupied by the Samsung pogo pin dongle but you can just remove the dongle and plug your own cable straight into the module. Bonus: the SlimFit module will still magnetically attach to the top of your display.
For the MacBook I also had to use a USB-A to USB-C converter dongle. In case it's useful the USB-C to USB-A cable I used was this one: https://www.amazon.co.uk/gp/product/B01GGKYS6E. Not sure about the origin of the A-to-C dongle. You should now see the camera in e.g. Photo Booth or Zoom.
For completeness I'll also mention here that under Linux the picture was corrupted in highest quality mode with lots of vertical lines and I had to step the resolution down to 640x480 before this went away. There's an app called Cheese that comes with most desktop Linux distributions which you can use for this. Otherwise it just magically worked as the SlimFit supports the UVC standard. Likewise under Windows 11 no drivers or configuration were required as UVC is supported out of the box.
And one final note in case it wasn't clear from the above - this is connecting the camera (and its built-in microphone) directly to your computer. The monitor still needs its own HDMI or USB-C connection for video and audio output from your computer. This also means that the monitor won't do all the fancy Alexa and Google Duo type stuff unless you reconnect the SlimFit the usual way, but I'm not going to lose any sleep over this :-)